[MNT] Update maintenance tools

xuyxu · xuyxu · commit 1fe30332b8d4 · 2021-01-27T16:42:01.000+08:00
diff --git a/build_tools/requirements.txt b/build_tools/requirements.txt
@@ -1,4 +1,5 @@
 flake8
 pytest-cov
 lightgbm
-xgboost
+xgboost
+cython>=0.28.5
